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This allows assembly coders to assume that certain bitmanip instructions, such as ORN, are always available regardless of the value of the GORISCV64 variable. The assembler will either emit the bitmanip instruction or will synthesise the instruction using two or more RV64G instructions.

Dependency
Upstreaming	COMPLETED	https://go-review.googlesource.com/c/go/+/611895 https://go-review.googlesource.com/c/go/+/572736 https://go-review.googlesource.com/c/go/+/565015 https://go-review.googlesource.com/c/go/+/572716 https://go-review.googlesource.com/c/go/+/653295
Upstream version
Contacts	Ludovic Henry

LR_02_038: Add bitmanip intrinsics to the Go assembler

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